1 files changed, 44 insertions, 0 deletions
diff --git a/web/js/labitrack.d/15-ratelimit.js b/web/js/labitrack.d/15-ratelimit.js
new file mode 100644
index 0000000..0af1ddc
--- /dev/null
+++ b/web/js/labitrack.d/15-ratelimit.js
@@ -0,0 +1,44 @@
+(function(){
+	function ratelimiter(args) {
+		this.in_progress = null;
+		this.needs_triggering = null;
+		this.callback = args[1];
+		this.ctx = args[2];
+		this.wait = args[0];
+	}
+
+	var rlpt = ratelimiter.prototype;
+
+	function trigger()
+	{
+		var t = this;
+		setTimeout(function(){
+			var args = t.in_progress;
+			t.in_progress = null;
+			if (t.needs_triggering !== null) {
+				t.in_progress = t.needs_triggering;
+				t.needs_triggering = null;
+				setTimeout(function(){
+					trigger.call(t);
+				}, 0);
+			}
+			t.callback.apply(t.ctx, args);
+		}, t.wait);
+	}
+
+	rlpt.kick = function(args){
+		if (this.in_progress !== null) {
+			this.needs_triggering = args;
+		} else {
+			this.in_progress = args;
+			trigger.apply(this);
+		}
+	};
+
+	λ.ratelimiter = function(){
+		var rl = new ratelimiter(arguments);
+		return function(){
+			rl.kick(arguments);
+		};
+	};
+}());